ENZYMES 1 ENZYMES Quick Quiz 1 Press the button when you’re sure… remember to take your time as you only get one chance!

ENZYMES 1 What 2 substances are made in the break down of the hydrogen peroxide by manganese dioxide? 1. Water and carbon dioxide 2. Water and carbon dioxide 3. Oxygen and food 4. Oxygen and water

ENZYMES 1 Which substance could we easily see being produced in this reaction? 1. Water 2. carbon dioxide 3. Oxygen 4. detergent

ENZYMES 1 What effect does the catalyst have on the break down of hydrogen peroxide? 1. Slows it down 2. Speeds it up 3. No effect 4. Turns hydrogen peroxide black

ENZYMES 1 How could we prove that the gas given off was in fact oxygen gas? 1. The gas would blow out a wooden splint 2. The gas would relight a glowing splint 3. The gas would blow out a glowing splint 4. The gas would relight a wooden splint

ENZYMES 1 Our livers contain an enzyme called catalase, which breaks down toxic (harmful) hydrogen peroxide into water and oxygen. 1. TRUE 2. FALSE

ENZYMES 1 Both the enzyme catalase and the chemical manganese dioxide break down hydrogen peroxide. 1. TRUE 2. FALSE

ENZYMES 1 Only catalase enzyme breaks down hydrogen peroxide. 1. TRUE 2. FALSE

ENZYMES 1 The enzyme catalase speeds up the break down of hydrogen peroxide which is a harmful substance. 1. TRUE 2. FALSE

ENZYMES 1 There is no difference between a biological washing powder and a non- biological washing powder in terms of the energy they use. There is no difference between a biological washing powder and a non- biological washing powder in terms of the energy they use. 1. TRUE 2. FALSE

ENZYMES 1 Enzymes are biological catalysts which speed up the rate of chemical reactions. Enzymes are biological catalysts which speed up the rate of chemical reactions. 1. TRUE 2. FALSE

ENZYMES 1 Enzymes can be extracted from plants and animals and used to clot milk to make cheese. 1. TRUE 2. FALSE

ENZYMES 1 Non-biological washing powders have enzymes added to them. 1. TRUE 2. FALSE

ENZYMES 1 Human enzymes work best below a temperature of 30°C. 1. TRUE 2. FALSE

ENZYMES 1 Enzymes are biological catalysts which slow down the rate of chemical reactions. 1. TRUE 2. FALSE

ENZYMES 1 Manganese dioxide is an enzyme, as it speeds up the chemical reaction. 1. TRUE 2. FALSE